feat(ecs/services): cloudwatch metrics and dashboard widgets

ecs/example/locust/locustfile.py

@@ -0,0 +1,29 @@
+import random
+
+from locust import HttpLocust, TaskSet, task, between
+
+
+class UserBehaviour(TaskSet):
+    @task(5)
+    def status_2xx(self):
+        self.client.get("/status/200")
+
+    @task(2)
+    def status_3xx(self):
+        self.client.get("/redirect-to", params=dict(
+            url="/status/200",
+            status_code=302,
+        ))
+
+    @task(2)
+    def status_4xx(self):
+        self.client.get("/status/400")
+
+    @task(1)
+    def status_5xx(self):
+        self.client.get("/status/500")
+
+
+class WebsiteUser(HttpLocust):
+    task_set = UserBehaviour
+    wait_time = between(5, 10)

ecs/example/locust/start

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -eux
+
+docker run \
+  -p 8089:8089 \
+  --volume "$PWD/locust/locustfile.py:/mnt/locust/locustfile.py" \
+  -e LOCUSTFILE_PATH=/mnt/locust/locustfile.py \
+  -e TARGET_URL="$(terraform output lb_url)" \
+  locustio/locust

ecs/example/main.tf

@@ -48,7 +48,8 @@ module "worker_task" {
   environment       = local.environment
   task              = "worker"
   image             = "kennethreitz/httpbin:latest"
-  memory_soft_limit = 128
+  memory_soft_limit = 48
+  cpu               = 128
 
   environment_variables = {
     DEBUG            = "True"
@@ -72,7 +73,8 @@ module "web_task" {
   environment       = local.environment
   task              = "web"
   image             = "kennethreitz/httpbin:latest"
-  memory_soft_limit = 128
+  memory_soft_limit = 48
+  cpu               = 128
   ports             = [80]
 
   environment_variables = {
@@ -87,7 +89,7 @@ module "web" {
   name                = "web"
   cluster_arn         = module.cluster.arn
   task_definition_arn = module.web_task.arn
-  desired_count       = 1
+  desired_count       = 2
 
   vpc_id           = module.cluster.vpc_id
   listener_arn     = module.cluster.http_listener_arn
@@ -96,6 +98,31 @@ module "web" {
   healthcheck_path = "/"
 }
 
+module "dashboard" {
+  source = "./../../cloudwatch/dashboard"
+
+  name = "terraform-ecs-example"
+  widgets = [
+    module.web.widgets.responses,
+    module.web.widgets.response_percentages,
+    module.web.widgets.response_time,
+    module.web.widgets.scaling,
+    module.web.widgets.cpu_utilization,
+    module.web.widgets.memory_utilization,
+    module.worker.widgets.scaling,
+    module.worker.widgets.cpu_utilization,
+    module.worker.widgets.memory_utilization,
+  ]
+}
+
 output "hosts_id" {
   value = module.hosts.id
 }
+
+output "dashboard_url" {
+  value = module.dashboard.url
+}
+
+output "lb_url" {
+  value = "http://${module.cluster.load_balancer_domain}"
+}

ecs/main.tf

@@ -23,5 +23,10 @@ resource "aws_ecs_cluster" "cluster" {
   count = var.create ? 1 : 0
 
   name = "${var.project}-${var.environment}"
+
+  setting {
+    name  = "containerInsights"
+    value = "enabled"
+  }
 }
 

ecs/services/web/README.md

@@ -117,10 +117,18 @@ Creates an ECS service exposed to the internet using an Application Load Balance
 
     Service id
 
+* `metrics`
+
+    Cloudwatch metrics, see [metrics.tf](./metrics.tf)
+
 * `target_group_arn`
 
     Load balancer target group ARN
 
 * `target_group_name`
 
     Load balancer target group name
+
+* `widgets`
+
+    Cloudwatch dashboard widgets, see [widgets.tf](./widgets.tf)

ecs/services/web/main.tf

@@ -86,4 +86,3 @@ resource "aws_lb_listener_rule" "service" {
     values = [var.rule_path]
   }
 }
-